Combined steam and hot-air heater



No. 624,l89. Patented May 2, l 899- J. DEMABEST. COMBINED STEAM AND HOT AIR HEATER.

[Application filed Feb. 13, 1899.)

(No Model.)

i K H 8 if a, q \1 m 8 I 4 a L Zbjifrceases. Mentor mmwuwn J M 1% UNITED STATES j PATENT OFFICE.

JOHN DE AREST, on MALDEN, MASSACHUSETTS.

COMBINED STEAM AND HOT-AIR HEATER.

SPEGIFICATIONforming part of Letters Patent No. 624,189, dated May 2, 1899.

Application filed February 13, 1399. Serial No. 705,368. (No model.)

To all whom it may concern:

. Be it known that 1, JOHN DEMAREST,Of Malden, county of Middlesex, and State of Massachusetts, have invented an Improvement in a Combined Steam and Hot-Air Heater,of which the following description, in connection with the accompanying drawings, is a specification, like letters on the drawings representing like parts.

My invention is an improved heater relating to that class in which hot-air and water systems are combined in one heater or furnace.

My invention relates to improved means for directing the products of combustion about the heater for the purpose of obtaining the greatest amount of heat therefrom and to the best advantage; and to this end I mount the Water boiler or heater on a horizontal baflieplate extending across the dome of the heatlug-chamber, the baflfle-plate thus dividing the dome into independent upper and lower portions, access from one to the other being provided through the baffle-plate adjacent the direct smoke-outlet pipe only, and at some portion of the baffle-plate remote therefrom I provide the indirect passages or outlets for the smoke.

The details of construction of my invention will be more fully pointed out in the course of the following description, reference being had to the accompanying drawings, illustrative of a preferred embodiment thereof, and the invention will be more particularlypointed out in the appended claims.

In the drawings, Figure 1 is a central vertical sectional view, partly broken away,showing the general construction of my improved furnace or heater. Fig. 2 is a horizontal crosssection taken on the line 2 2, Fig. 1.

It will be unnecessary for me to herein describe all the details of construction of the furnace, inasmuch as they may in general be such as are commonly employed in this class of heaters and will include a fire-pot a, dome a, having a direct outlet-flue or smoke-passage a leading into the smoke-pipe a and all inclosed in a usual casing or jacket a, to which the hot-air fines may be connected at a in usual manner. Within the dome a, I

mount the hot-water or steam generator, preferably employing for this purpose a drop-tube boiler E of the kind shown in my Patent No. 539,978, dated May 28, 1895.

The boiler E has an overhanging or projecting edge e, which rests on a diaphragm or baffle-plate b, constituting the leading feature of my invention. This baflle-plate extends horizontally from side to side of the dome a, dividing the latter into an upper portion A and a lower portion A. The bafile-plate is provided with an opening b'at its rear side immediately beneath the inlet end of the smokeflue a and this is the only passage for the smoke through the baffle-plate from the chamber A to the upper chamber A, so that while the drop-tubes e of the boiler are always sub jected to the heated products of combustion passing through the chamber A it will be understood that when the damper d in the flue a, is open the smoke passes directly from the chamber A through the opening 6 and out through the flue a and up the chimney without heating the dome a to any great extent; but when it is desired to heat the dome, and thereby produce a large volume of hot air for circulation through the hot-air flues of that part of the heater system, I close the damper d and compel the products of combustion to pass in the direction of the arrows beneath the top of the dome and around the body of the boiler E to the front part of the baffleplate, where the latter is provided with fines 12 shown as two in number, one at each side, these flues leading down through the chamber A and terminating in elbows b at the ends of a usual radiator-flue b, which connects at its rear end by means of a flue b with the smoke outlet or pipe 0,

A prime object of my invention is to make it easy to control the heating effects of the furnace, so that the water may be heated as desired and the hot air may be provided to such extent as required, and the latter can to a large degree be regulated independently of the former.

Under certain conditions it is desirable to further control the direction of the products of combustion, and accordingly I provide reg ulators, shown as slide-dampers d, operated by handles 01 which are arranged to close the openings 12 of the baffle-plate. Thus if it is desired to cause the products of combustion to follow one path and to stay in the extent of the indirect fines, both dampers d will be closed partially only, and if it isfound that for any cause the smoke does not flow through one opening I) the other one may be temporarily closed until the circulation through the first opening has been estab-,

lished.

and hot-air systems have been combined in one heater and that a halide-plate has been interposed in order to direct the products of combustion in various ways, but so far as I am aware it is new to interpose a diaphragm or substantially horizontal bafiie-plate or separating-wall, such as I have shown at b, whereby the dome isseparated into two compartments--upper andlower-and the smoke may be compelled to envelop the boiler and pass out through the outlets b or escape directly into the smoke-stack,,ifpreferred. The manneri-n which I support the parts is also of conclaim as new, and desire to secure by Letters Patent, is

1.. A heater ,comprising a heating-dome and Z a water-boiler, said dome being divided into upper and lower compartments by an intermediate baffie-plate extending from side to; side thereof, and said water-boilerbeingcentrally supported Within said dome on said;

baflle-plate, adirect outlet-flue leading from said dome above the bafiie-plate and the baf- .fie-plate having an openingimmediately below said flue, the heater having indirect outlets for the products of combustion and fines connecting from said indirect outlets through the front part of said bafiie-plate with said up per compartment, substantially as described.

2. A combined hot air and water heater,

comprising a' heating-dome having a water boiler centrally located therein, a substanial y horizontal baflie-vplate surronndin g said water-boiler and separating said heating- I am aware that hot-water or steam boilers domeiinto upper and lower compartments, an opening through said'baffle-plate at its rear side affording communication between said compartments, a smoke-outlet adjacent said openingfor the direct escape o e smoke, and 1m mltletfiue through the front pa t o he bafile plate vfor the indirect escape of the smoke, substantially as described.

3.. A combined :hot air and water heater, comprising a ,heati-ngfdome having a waterboiler centrally located therein, a substantially horizontal baffle-plate surrounding said water -DOUG)! and separating said heatingdoxne into npperand lower compartments, a opening through said bafiie-plate at its rear side afiording communication between said compartments, a smoke-outlet adjacent said opening for the direct escape of the s oke,

' and a plura ity er outlet-flees, and regulators for said outlet-fines, substantially as described.

In testimony whereof I h v ign y name to this specification in the presence of two subscribing witnesses.-

JOHN DEMAREST.

Witnesses;

Gno. H. MAXWELL, Geo, GREGORY. 

